<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>035-逻辑.html</title>
	<script>
		console.log(1 && 100)
		console.log(3 || 90)
			var a = 1;
		//1<a<5

		console.log(!a);

		console.log(0 && 1);//0
		console.log(1 && 0);//0
		console.log(1 && 2);//2

		console.log(0 || 1);//1
		console.log(1 || 0);//1
		console.log(1 || 2);//1
		console.log(0 || null);//null

	</script>
</head>
<body>
	
</body>
</html>